Speaker
Dr
Thomas Primer
(University of Arizona)
Description
We present calculations of the $K\to\pi,l\nu$ and $D\to\pi,l\nu$ semileptonic form factors at $q^2=0$.
These form factors are important for the determination of the CKM matrix elements $\lvert{V_{us}}\rvert$ and $\lvert{V_{cd}}\rvert$ respectively.
This work uses the HISQ action for both valence quarks and sea quarks on MILC $N_f=2+1+1$ configurations.
We employ twisted boundary conditions to calculate the form factors at zero momentum transfer directly.
The $K\to\pi$ results are an update to previously published results with new data at the physical quark mass.
The $D\to\pi$ results are preliminary, working at the physical light quark mass at three different lattice spacings down to 0.06 fm.
Primary author
Dr
Thomas Primer
(University of Arizona)
